Abstract
The intensity distribution in the focal region for the tight focusing of needle of azimuthally polarized beam with complex-spiral phase mask is studied on the basis of the vector diffraction theory. Here we report a new method that generates a needle of transversely polarized light beam with sub diffraction beam size (0.442 \(\uplambda \)) that propagates without divergence over a long distance (of about 12.6 \(\uplambda \)) in free space (NA \(=\) 0.95). The authors also expect such a light needle of transversely polarized beam may find its application when using optical materials or instruments responsive to the transversal field only.
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